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BaseRepresentation
bin10001011100111100…
…000001011111101001
31210100221221022100021
4101130330001133221
5301334202422232
612335244040441
71232241534253
oct213474013751
953327838307
1018739107817
117a46813071
12376b833121
1319c83b33a1
14c9aa64cd3
1574a203397
hex45cf017e9

18739107817 has 2 divisors, whose sum is σ = 18739107818. Its totient is φ = 18739107816.

The previous prime is 18739107809. The next prime is 18739107853. The reversal of 18739107817 is 71870193781.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17560490256 + 1178617561 = 132516^2 + 34331^2 .

It is a cyclic number.

It is not a de Polignac number, because 18739107817 - 23 = 18739107809 is a prime.

It is not a weakly prime, because it can be changed into another prime (18739102817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9369553908 + 9369553909.

It is an arithmetic number, because the mean of its divisors is an integer number (9369553909).

Almost surely, 218739107817 is an apocalyptic number.

It is an amenable number.

18739107817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18739107817 is an equidigital number, since it uses as much as digits as its factorization.

18739107817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 592704, while the sum is 52.

The spelling of 18739107817 in words is "eighteen billion, seven hundred thirty-nine million, one hundred seven thousand, eight hundred seventeen".